Recently there has been a question about what should be included in the list of rules Immortals adhere to. It has long been accepted that the list consisted of both hard and fast rules such as no fighting on holy ground, and slightly (and only slightly) more flexible guidelines about not making your fights public. There is a little leeway on that one, since Immortals do sometimes let mortals into their lives.
The rules are:
No Immortal can fight on Holy Ground, no matter who regards it as Holy
Immortal
Combat is one on one — no outside interference, no two on one
Mortals must not learn about Immortals — if you're killed, you move on/don't make a spectacle of yourself
No Immortal can have natural children
In the end, there can be only one — the last one will receive all the power of all the Immortals who ever lived
The rule in contention is to keep one's fights secret, which is the logical offshoot of not letting mortals learn of the existence of Immortals. The contributor who claims this does not apply, seems only to base his view on the original movie and nothing else. In the original movie, there is no backstory, no other immortals to worry about, if the Kurgan gets spotted, well, he's pretty sure he will be ruling the world pretty soon, so he doesn't much care. In the series, however, it's pointed out on several occasions that letting mortals in on the Immortal secret would be a bad thing. The episodes, Finale and Black Tower spring to mind. The implication has always been that Immortals keep it to themselves, and that means fights will not be staged as a cage match for all to see.
If you have something you'd like to add, please do. Would like to see a general consensus on what the rules should be before a final ruling as to the list included in the article.